I assume I can negotiate a package deal for all 28 units.  

I suggest getting the going rate for contruction with like materials and craftsmanship per sq foot. multiply that by the size of the structure to come up with aprox replacement cost.

I only need to pull credit if I haven't pulled one in the last 6-12 months or I suspect material changes.  

An example of this is a borrower who hits 10 but wants to free up some room to get more financed properties so he/she elects to get a blanket loan on the package of 10 properties (one note securing all 10 trust deeds or mortgages) in the LLC name.

Purchase price: $105,000 Cash invested: $110,000 Purchased as part of a 6 unit package deal.

There are multiple package options at biggerpockets.com/store .

My leases state no smoking or vaping  of any material on the property. 

If this is mainly sheetrock and cleanup work, the most expensive cost will be the labor and likely not the materials.  

Be sure to verify it's legal for you to use before you spend any time on it.Biggerpockets sells a Lease Agreement Package under "TOOLS" at the top of your screen. $100 for a lease and several other documents, written by investors and attorney approved for your state.

It was very entertaining.I did not sign up for the Mastery Program, but all the functionality of the Software Package is making me drool.